These include other major dating sites, like Match.com, as well as news website the Daily Beast and web properties like Dictionary.com.

Court rulings

Mr Eich, who is the inventor of JavaScript, was appointed to lead the open-source browser firm on 24 March.

He is listed publicly as having donated to a campaign in support of California's Proposition 8 campaign in 2008, which had sought to ban gay marriage in the western US state.

Although it was initially passed, it was later overturned by a district court judge in 2010.

After Mr Eich's appointment was announced, supporters of same-sex marriage in the US, including many Mozilla employees, expressed unease at the decision.

Mozilla's head of education, Christie Koehler, who is gay, wrote on her blog: "It's hard for me to think of a scenario where someone could donate to that campaign without feeling that queer folks are less deserving of basic rights."

However, she added that while she was personally disappointed, she said she did not think it would affect her work at Mozilla.

Mr Eich responded in a post, saying that he remained committed to openness in the work place and offering assurances that Mozilla would not change certain policies, like health insurance for the partners of gay employees.

"I am committed to ensuring that Mozilla is, and will remain, a place that includes and supports everyone, regardless of sexual orientation, gender identity, age, race, ethnicity, economic status, or religion," he wrote.